   [day rowNum]
   (nth (timetable-get-day day) rowNum))
 
-; First argument is a day in `Timetable - the return value of
+; First argument is a day in `TIMETABLE` - the return value of
 ; `timetable-get-day` function
 (defmethod timetable-get-day-row false
   [ttDay rowNum]


(defn- timetable-row-not-empty?
  "Returns true if there at least one lesson for a given day and row in
   `Timetable`. Returns false otherwise."
  ([ttRow] (not (timetable-row-empty? ttRow)))

  ([day rowNum] (not (timetable-row-empty? day rowNum))))

            ttRow)))

(defn- timetable-row-empty?
  "Returns true if there is no lesson for a given day and row in `TIMETABLE`.
   Returns false otherwise."
  ([ttRow] (empty? ttRow))

